Color photography.



L. S. GLOVER.

GOLOR PHOTOGRAPHY. APPLICATION FILED JULY 16, 1912.

Patented Feb. 24, 1914.

r I 'llllllllllll UNITED STA'I 31 S I AEENT curios;

LYCURGUS SOLON GLOVER, OI DETROIT, MICHIGAN.

COLOR PHOTOGRAPHY.-

Specification-of Letters Patent.

Patented Feb. 24, 1914.

Application filed J my 16, 1912. Serial No. 709,805.

To all whom it may concern:

-Be it known that I, Lyoouous SoLoN Gnovnn, a citizen of the UnitedStates, re-

siding at Detroit, in the county of Wayne and State of Michigan, haveinvented newand useful Improvements in Color Photography, of which thefollowing is a specification.

This invention relates to the process of making color records by meansof color screens and pan chromatic plates or films, and has for itspurpose to render the process more expeditious and cheaper.

I employ but one exposure, producing one pair of stereoscopiccolor-record negatives, from which any number of color-recordstereograms may-be reproduced with economy and despatch. p

I will now proceed to describe my invention in detail, reference beinghad to the accompanying drawings, like letters indicating like parts. i

First I prepare two color screens which I shall hereinafter designate asred and green filters. These filters'I determine by dividing thespectrum into four fundamental colors, viz crimson, yellow, green andblue, by a mixture of which, in suitable proportions, any color innature can be matched or reproduced The hues of these four fundamentalcolors:' red, yellow, green and blue, I group into one pair of compoundcolors, viz :-yellow'-red, and blue-green so that when the elements ofthese two compound colors are mechanically mixed as pigments, or stains,they produce black, while the effect of their optical combination whenviewed by transmitted or reflected light through a pair of binocularstereoscopic prisms is to cause them to fuse into one even grayishcombination, producing a sensation of white light. With such a pair offilters: one of yellowish red, the other of bluish green I am providedwith an extremely sensitive chromatic balance, susceptible to all raysof the spectrum or to any degradation of the same when applied in themanner hereinafter specified. Through the instrumentality of an ordinarystereoscopic camera and a panchromatic plate or film, I make astereoscopic pair of color-record negatives of any object, one image ofwhich is formed by the rays of light passing through the red filter andthe other image of which is formed by the rays, passing through thesensiti'veness of the present panchromatic emulsions to the ultra-violetrays I may employ a third screen, or filter of yellow color but adaptedto the said plate, to subdue the violet rays passing the lens system ashereinafter indicated.

ronr this negative, which constitutes the pair of color-records, I maymake any number of transparencies, .or diapositives, by

contact printing or otherwise in a well known manner, any one of which,when properly mounted, constitutes a faithful colorrecord-stereogram ofthe object photographed. These stereograms may be viewed or projectedthrough the filters by which the negatives were madeor a like pair offilters by means of any of the well known stereoscopic apparatus, when aphotograph of the original object will appear in all its beauty ofatmosphere, distance, solidity and color.

The chromatic filters R and G, serve, Firsts to split up the pair ofstereoscopic images presented by the lens-system into two monochromaticcolor records. Second, and lastly: to combine andreconstruct, bystereoscopic vision, the two-"monochromatic images of the diapositiveinto original form and color.

In the accompanying drawings:-Figure l is a general View of my chromaticbalance filters, R and G. Fig. 2 is a plan View of the lens system ofthe well known stereoscopic camera, providedwith my system of filters.Fig. 3 is a plan view of the well known stereoscope, also provided withmy system of filters.

In Fig. 2 O, 0 indicates the object to be photographed; L, L the lenssystem; Y, Y

the compensating screens; R, G the filters;

P the panchromatic plate or film; N, N the color record negative.

In Fig. 3 K, K indicate the viewing prisms; D, D the diapositive colorrecord stereogram; R and G the filters; X the positive of the image asreconstructed.

I do not confine myself to this particular form of apparatus, since itis obvious that any of the known stereoscopic apparatus may besubstituted, or the record negative may be converted directly into apositive by reversal, before fixing, in awell known manner.

I am aware that color record negatives and transparencies haveheretofore been made through the instrumentality of color screens andpanchromatic plates. I therefore do not claim broadly the art ofproducing such records.

I do claim, however, and desire to protect by Letters Patent- 1. In astereoscopic apparatus for producing photographic images insubstantially theirnatural colors, the combination with astereoscopicpair of lenses, of an orange-red filter, arranged tocooperate With one of said lenses, and a bluish-green filter arranged tocooperate With the other lens, so as to filter the light, passingthrough said lenses substantially as set forth.

2. In a stereoscopic apparatus for producing photographic images insubstantially their natural colors from a single stereoscopic pair ofphotographic prints, comprising a film having two independentmonochromatic color value images, one of said 2 images having anorange-red color value and the other having a bluish-green color value,the combination With a stereoscopic lens system; of an orange-red filterand a bluishgreen filter, said images and filters placed 2 axially tothe oculars and adapted to present to the eyes, in the fusing of saidimages and filters, a sensation of one image in approximately naturalrelief and color, substantially as set forth.

' In testimony Whereof I have signed my name to this specification inthe presence of I two subscribing Witnesses.

LYCU RGUS SOLON GLOVER.

lVitnesses J. EDWIN-GILES, C. R. BRENEMAN.

